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2 Sheets-Sheet 1;

(No Model.)

0. B. OOTTRELL. PRINTING MACHINE.

N0.'47Z.Z06. Patented Apr. 5, 1892.

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(No Model.)

0. B. OOTTRELL.

PRINTING MACHINE.

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NrTE TATES CALVERT B. COTTRELL, OF WESTERLY, RHODE ISLAND.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 472,206, dated April 5,1892.

Application filed October 24, 1891. Serial No. 409,717. (No model.)

To all whom it may concern.-

Be it known that I, CALVERT B. COTTRELL, of Westerly, in the county oflVashington and State of Rhode Island, have invented a new and usefulImprovement in Printing -Machines, of which the following is aspecification.

In both kinds of cylinder printing-machines heretofore employed-via,those in which the form or plate carrier consists of a rotary cylinderand those in which the said carrier consists of a flat reciprocatingform-bed-there is a tendency of those edges of the form or plate whichare transverse to the direction of its movement to effect a heavierimpression than the other parts of the form or plate, or, in otherwords, to produce aslur. This effect is owing to the yielding of theimpression-cylinder or of the form-carrier, or of both, whichunavoidably takes place even in the strongest machines during theprinting operation and the reaction or return of said cylinder andcarrier to their normal relation as the printingsurfaces of the formleave the sheet on the cylinder.

The object of my invention is to bear off the cylinder and theform-carrierfrom each other at and near the said edges of the form asthe said edges arrive at and leave the impressioncylinder and sheet, andthus to obviate the aforesaid objectionable effect; and to this end myinvention consists principally in bearingpieces attached to the saidcylinder or carrier at the requisite points, substantially ashereinafter described.

As the objectionable effect hereinabove explained is generally morepronounced at the rear edges of the plate or form and the remedytherefor is more desirable at those edges and may be sometimes appliedonly in relation with said edges, I have only illustrated in thedrawings and will only particularly describe my invention so applied.This illustration and the description thereof will, however, besufficient to enable others skilled in the art to apply it in properrelation to the edges at the head of the form or plate or to any edgeswhere it may be desirable to apply it.

Figures 1, 2, 3, and 4 of the drawings illustrate the application of myinvention in con nection with a cylinder printing-machine in scale thanthe previously-mentioned figures.

Fig. 4 is a perspective view of one of the bolts employed to attach thebearing-pieces to the cylinder. Figs. 5 and 6 illustrate the application of my invention to a cylinder printingmachine in which the formor. plate carrier consists of a fiat bed, Fig. 5 representing an endview of the cylinder and a longitudinal section of the form-bed and formand Fig. 6 representing a face view of the cylinder and a transversesection of the form-bed and form.

I will first describe Figs. 1, 2, 3, and at.

A is the form or plate cylinder, and B the impression-cylinder, theshafts of which may be mounted in bearings in the manner common toprinting-machines of this kind. These cylinders have at their endscontinuous circumferential bearers a and 19, like those of suchcylinders as are in common use.

0 are the bearing-pieces, which constitute the principal feature of myinvention and which are applied at both ends of the cylinder. In orderto provide for the attachment of this bearing, the ordinary bearers b ofthe impression-cylinder are both cut away or reduced all around thecircumference of the cylinder, as shown at the upper right-hand cornerof Fig. 2 and in Fig. 3,in the form of a rabbet c, and in the back ofthis rabbet a dovetailed groove d is formed around the cylinder.

The bearing-pieces G O consist of short curved plates, the profile formof which is shown in Fig. 1, and which are secured to the cylinder Bwithin one of the rabbets c by means of two similar screw-bolts e e, oneof which is shown in perspective in Fig. 4, the heads of the said boltsbeing dovetailed and curved to fit their respective groove cl, which iswidened at one point in its circumference to allow the heads of thebolts to enter, as

shown at d in Fig. 1. The said bearingpieces are pivotally adjustableupon their bolts 6, and such adjustment is permitted to a limited extentby the elongation in the proper direction of the holes f through whichtheir bolts 0 pass. This adjustment of each bearing-piece is effected bymeans of an adjusting-screw g, screwing through a widened portion of thesaid piece and bearing upon the cylindrical surfaces 0' of the rabbet c.The adjustment is such that a slightly-rounded or cam-like portion ofthe bearing-piece projects only about or little more than the thicknessof a sheet of paper beyond the ordinary bearer b of the cylinder. henthe adjustment has been made, it is secured by screwing up the nuts 7).71 on the screw-bolts e e. The said bearing-pieces are employed inpairs, those of each pair being arranged opposite each other at thetwo'ends of the cylinder and there being as many pairs as there areforms or pages in a circumferential series, each pair being arranged onthe cylinder B opposite the rear edge CL of a form or page. In theexample represented there are two forms or pages A A in thecircumferential series, and consequently two pairs of bearing-pieces Con the cylinder. \Vhen these bearing-pieces are brought by the rotationof the impressioncylinder B into contact with the bearers a on the formor plate cylinder, the two cylinders are borne oil": from each other,and so the pressure upon the sheet at and in rear of the rear edges a ofthe form or plates is eased and the slurrin g is prevented.

The adjustment of the bearing-pieces C to their proper position on thecircumference of the cylindei-Bisprovidedforbyslackeningthe nuts h h,which permits the said pieces to be moved in the direction of thecircumference of the cylinder, the adjustment being, as has beenhereinbefore mentioned, secured by screwing up the nuts.

I will now proceed to describe the example of my invention shown inFigs. 5 and 6.

A is the reciprocating form-bed, having on its edges continuous bearers(L a, as is common. The impression-cylinder 13 in this example has thebearing-pieces G 0 applied in precisely the same manner as the cylinderB in the first example, and, as the corresponding parts on the saidcylinder in both examples are designated by the same letters, no furtherdescription of said parts is necessary, except to say that thebearing-pieces O are adjusted with reference to the rear edges a of theforms or pages on the bed in the same way as they are adjusted to therear edges a of the curved form of the first example.

I have herein described the bearers b of the cylinder as cut away tomake room for the bearing-pieces C. Of course the cutting away wouldonly be done in adapting my invention to an old machine. In a newmachine the bearer on the cylinder may be made of a suitable width andthe cylinder prolonged at its ends to form bearings like those 0' forthe adjusting-screws g of the bearingpieces 0 and the bearers on theform cylinder or bed be made as much wider than the bearers Z) of theimpression-cylinder as may be necessary to give room for thebearingpieces C to run in contact with the said bearers a. It is obviousthat the adjustable bearing-pieces 0, instead of being applied to theimpression-cylinder, might be applied to the form or plate to operateinconnection with continuous bearers on the impression-cylinder.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, with the impressioncylinder and form-carrier of aprinting-machine, each having continuous bearers, of bearing-pieces onthe one arranged at intervals on the line of its own continuous bearersand adjustable toward and from the con tin uous bearers of the other,substantially as herein set forth.

2. In a printing-machine, the combination, with the impression-cylinderand f0rm-carrier, of a bearer on the one and bearing-pieces on the otheradjustable in the direction of the length or profile of the face of thelatter, substantially as and for the purpose herein set forth.

3. In a printing-machine, the combination, with the impression-cylinderand form-carrier, of bearers on the one and bearing-pieces on the other,which are adjustable both outwardly from and in the direction of thelength of the face of the latter, substantially as herein set forth.

at. In a printing-machine, the combination, with the impression-cylinderand form-carrier, the latter having continuous bearers, ofbearing-pieces on the other, which are adjustable in the direction ofits circumference, substantially as herein set forth.

CALVERT B. CO'FRELL. Witnesses:

A. R. STILLMAN, B. FRANK LAKE.

